Metal-stamping machine.



PATENTED NOV. 21, 1905.

1?. SPORER. METAL STAMPING MACHINE.

APPLICATION FILED MAR.28, 1905.

2 SHEETS-SHEET l.

PATENTED NOV. 21, 1905.

F. SPORER. METAL STAMPING MACHINE.

APPLICATION FILED MAR.28, 1905.

2 SHEETSSHBET 2.

UNITED srn'rns FRIEDRICH SPORER, OF NUREMBERG, GERMANY.

METAL-STAMPING MACHINE.

Specification of Letters Patent.

Patented Nov. 21, 1905.

Application filed March 28,1905. Serial No. 252,577.

To fbZZ whmn it may concern.-

Be it known that I, FRIEDRICH SPoRER, manufacturer, a subject of the German Emperor, residing at Nuremberg, Bavaria, Germany, have invented new anduseful Improvements in Metal-Stamping Machines, of which the following is a specification.

In all stamping apparatus hitherto employed for powdering metal the want of an automatic stirring mechanism which after each blow of the stamps or pestles turns the material to be stamped from beneath upward has become very apparent. Of course in all stamping apparatus in which coarse particles are reduced to fine powder the formation of the fine powder on the bottom of the mortar or the like proceeds of itself. In most materials which are pulverized by stamping apparatus it is immaterial whether the already partially finely stamped material be immediately removed from the pan or mortar or remains therein until the entire contents are pulverized. The case is different in pulverizing metals. If in this case the sufficiently finely pulverized metal remains too long in the mortar, it suffers very materially owing to heating, which lowers it in value. In the metal-stamping apparatus at present employed the stamped material must therefore be frequently removed from the mortars with great expenditure of labor and time and the fine material separated from the coarse, after which the coarser particles are again returned to the mortar. Even in metal-stamping apparatus with air-suction orwith automatic feed and removal of the material stamped there are no stirring mechanisms. The finely-divided metal powder therefore remains much too long on the bottom or floor of the mortar in such stamping apparatus, while the less fine or coarser stamped material lies at the top. Thereby, more particularly in stamping apparatus in which the material stamped is automatically introduced and removed, as the removal naturally can only take place at the upper layer of the introduced material, for the major part always only the coarser half-finished material is conveyed onto the sifting appliance and from there back into the mortar, V

while the finely-pulverized material in the lower layers is always covered by the freshlyintroduced coarser part and therefore cannot reach the surface sufficiently quickly to reach the sifting apparatus.

This drawback is entirely removed in this improved metal-stamping apparatus by the introduction of automatic means for stirring the material, which means before each blow of the separate stamps turns over from beneath upward the material to be stamped lying under the said stamps. As the finer particles of thematerial to be stamped avoid, in the manner described, the unnecessary blows of the stamps they undergo no or only little heating and therefore retain their pure metallic gloss and improve in value. By this improved arrangement the effectiveness of the stamping apparatus is considerably increased as the material is immediately re moved. when finished.

In the accompanying drawings, Figure 1 is a view in section of the improved apparatus, only the parts directly located in the plane of section and immediately behind it being shown for the sake of greater olearness: Fig. 2 is a plan view of the mortar and pestles or stamps, omitting those stamps beneath which the stirrer is immediately located. Figs. 3 to 5 are views of another form of construction of the stirring-arm.

The stamp apparatus is driven by a belt pulley a, the shaft 1) of which carries a bevelwheel 6, gearing with a bevel-wheel c on a vertical main shaft (2. The main shaft d has at top a lifting-worm f and projects at the bottom into a mortar 6, provided with an annular stamping-surface g and closed by a cover h. The lifting-worm acts in conjunction with a series of (for instance, twelve) stamps or pestles 7c, arranged in a circle in such a way that in its rotation it slowly lifts successively the stamps or pestles and then allows them to fall suddenly. The stamps or pestles are mounted in the upper part of the machine-frame Z andguided in the cover h of the mortar by means of stuffing-boxes. The mortar has one or more lateral flaps m and also a nozzle 0, closed by a fine sieve n, on which nozzle a sack p, for receiving the finished-metal powder, is suspended.

A stirrer-arm g is by the present invention placed on the lower end of the main shaft d,

which arm extends down to the stampingsurface 9 and is formed like a plowshare. The stirrer-arm is keyed in such a way on the main shaft (1 that it always stands precisely under the pestle or stamp which is raised highest and will fall next. In other words, the scraper-arm sweeps around the die, and owing to its fixed angular relation wlth respect to the cam, as the stamps are raised one after another it is permitted to pass. In this way the material to be stamped is turned from beneath upward and lifted up immediately before each blow. The hub of the stirrer-arm q also contains two windvanes r, which produce air-eddies, and thereby force the finished metallic powder whirled up through the sieve n into the sack 19.

By the second form of construction (shown in Figs. 3 to 5) the stirrer-arm has for its object to throw out, by means of the stirrerscoop, the material stamped and urge it forward and to one side, so that the finished powdered metal reaches the sieves without further difficulty and is conveyed out of the machine. For this object the scoop s of the stirrer-arm Q is irregularly formed and has on its outer side an oblique vertical edge or flange t, which extends backward and inward.

The edge of the arm exactly fits the inner contour and the bottom of the mortar i and only leaves vacant a very narrow interval between it and these parts.

When the main shaft d revolves, the mate rial to be stamped contained in the lower part of the annular groove of the pan or mortar i is turned from beneath upward by the scoop, and-at the same time the flange or edge t throws the finished metallic powder outward and forward, so that it is thrown against and through the metal sieve n and passes into the exit-nozzle 0.

I declare that what I claim is I11 a stamp-mill the combination with the ring-shaped mortar and plurality of stamps cooperating therewith, of a cam cooperating with said stamps for raising them successively, a vertical shaft depending from said cam, and a stirrer-arm carried by said shaft, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

FRIEDRICH SPORER;

Witnesses:

OSCAR BOOK, ANDREAS SLroi-r. 

